<template>
  <qrcode-stream :camera="camera" :torch="torchActive" @decode="onDecode" @init="onInit">
    <div>
      <div class="qr-scanner">
        <div class="box">
          <div class="line"></div>
          <div class="angle"></div>
        </div>
        <div class="txt">
          <!-- <div class="myQrcode">将二维码放入框内</div> -->
        </div>
      </div>
    </div>
  </qrcode-stream>
</template>

<script>
import { QrcodeStream } from 'vue-qrcode-reader'

export default {
  // 注册
  components: { QrcodeStream },

  data() {
    return {
      result: '', // 扫码结果信息
      error: '', // 错误信息
      // show: false,
      // qrcode: false,
      qrcode: true,
      torchActive: false,
      camera: 'front'
    }
  },
  methods: {
    onDecode(result) {
      this.$emit('getScanResult', result)
    },
    async onInit(promise) {
      const { capabilities } = await promise
      const TORCH_IS_SUPPORTED = !!capabilities.torch
      try {
        await promise
      } catch (error) {
        if (error.name === 'NotAllowedError') {
          this.error = 'ERROR: 您需要授予相机访问权限'
        } else if (error.name === 'NotFoundError') {
          this.error = 'ERROR: 这个设备上没有摄像头'
        } else if (error.name === 'NotSupportedError') {
          this.error = 'ERROR: 所需的安全上下文(HTTPS、本地主机)'
        } else if (error.name === 'NotReadableError') {
          this.error = 'ERROR: 相机被占用'
        } else if (error.name === 'OverconstrainedError') {
          this.error = 'ERROR: 安装摄像头不合适'
        } else if (error.name === 'StreamApiNotSupportedError') {
          this.error = 'ERROR: 此浏览器不支持流API'
        }
      }
    }
  }
}
</script>
<style scoped lang="less">
.error {
  font-weight: bold;
  color: red;
}
.cameraMessage {
  width: 100%;
  height: 60px;
}
.qr-scanner {
  background-image: linear-gradient(
      0deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
    ),
    linear-gradient(
      90deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
    );
  background-size: 3rem 3rem;
  background-position: -1rem -1rem;
  width: 100%;
  /* height: 100%; */
  // height: 100vh;
  height: 358px;
  position: relative;
  background-color: #1110;

  /* background-color: #111; */
}
.qr-scanner .box {
  width: 213px;
  height: 213px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  overflow: hidden;
  border: 0.1rem solid rgba(0, 255, 51, 0.2);
  /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
}
.qr-scanner .txt {
  width: 100%;
  height: 35px;
  line-height: 35px;
  font-size: 14px;
  text-align: center;
  /* color: #f9f9f9; */
  margin: 0 auto;
  position: absolute;
  top: 45%;
  left: 0;
}
.qr-scanner .myQrcode {
  text-align: center;
  color: red;
}
.qr-scanner .line {
  height: calc(100% - 2px);
  width: 100%;
  background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
  border-bottom: 3px solid #00ff33;
  transform: translateY(-100%);
  animation: radar-beam 2s infinite alternate;
  animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
  animation-delay: 1.4s;
}

.qr-scanner .box:after,
.qr-scanner .box:before,
.qr-scanner .angle:after,
.qr-scanner .angle:before {
  content: '';
  display: block;
  position: absolute;
  width: 3vw;
  height: 3vw;

  border: 0.2rem solid transparent;
}

.qr-scanner .box:after,
.qr-scanner .box:before {
  top: 0;
  border-top-color: #00ff33;
}

.qr-scanner .angle:after,
.qr-scanner .angle:before {
  bottom: 0;
  border-bottom-color: #00ff33;
}

.qr-scanner .box:before,
.qr-scanner .angle:before {
  left: 0;
  border-left-color: #00ff33;
}

.qr-scanner .box:after,
.qr-scanner .angle:after {
  right: 0;
  border-right-color: #00ff33;
}

@keyframes radar-beam {
  0% {
    transform: translateY(-100%);
  }

  100% {
    transform: translateY(0);
  }
}
</style>
